很多次面试都遇到了一个问题: 线程有那几个状态?
OK, 线程到底有哪几个状态?
看代码可知: 5个状态, NEW, RUNNABLE, RUNNING, TERMINATE, BLOCKED, WAITING, TIMED_WAITING
public enum State { /** * Thread state for a thread which has not yet started. */ NEW, /** * Thread state for a runnable thread. A thread in the runnable * state is executing in the Java virtual machine but it may * be waiting for other resources from the operating system * such as processor. */ RUNNABLE, /** * Thread state for a thread blocked waiting for a monitor lock. * A thread in the blocked state is waiting for a monitor lock * to enter a synchronized block/method or * reenter a synchronized block/method after calling * {@link Object#wait() Object.wait}. */ BLOCKED, /** * Thread state for a waiting thread. * A thread is in the waiting state due to calling one of the * following methods: * <ul> * <li>{@link Object#wait() Object.wait} with no timeout</li> * <li>{@link #join() Thread.join} with no timeout</li> * <li>{@link LockSupport#park() LockSupport.park}</li> * </ul> * * <p>A thread in the waiting state is waiting for another thread to * perform a particular action. * * For example, a thread that has called <tt>Object.wait()</tt> * on an object is waiting for another thread to call * <tt>Object.notify()</tt> or <tt>Object.notifyAll()</tt> on * that object. A thread that has called <tt>Thread.join()</tt> * is waiting for a specified thread to terminate. */ WAITING, /** * Thread state for a waiting thread with a specified waiting time. * A thread is in the timed waiting state due to calling one of * the following methods with a specified positive waiting time: * <ul> * <li>{@link #sleep Thread.sleep}</li> * <li>{@link Object#wait(long) Object.wait} with timeout</li> * <li>{@link #join(long) Thread.join} with timeout</li> * <li>{@link LockSupport#parkNanos LockSupport.parkNanos}</li> * <li>{@link LockSupport#parkUntil LockSupport.parkUntil}</li> * </ul> */ TIMED_WAITING, /** * Thread state for a terminated thread. * The thread has completed execution. */ TERMINATED; }
状态实例见代码
public class TestJava { private final static Object lock = new Object(); public static void main(String[] args) throws InterruptedException { Thread t = new Thread(){ public void run(){ System.out.println("RUNNING: " + this.getState()); synchronized(lock){ try { Thread.sleep(3000); lock.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } } }; System.out.println("NOT START:" + t.getState()); t.start(); while (true){ Thread.sleep(2000); System.out.println("WAITING:" + t.getState()); synchronized (lock){ System.out.println("MONITOR LOCK:" + t.getState()); lock.notify(); System.out.println("AFTER NOTIFY: " + t.getState()); } Thread.sleep(10000); } } }
状态转换图:
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